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January 31, 2015

January 31, 2015

Posted by **Anonymous** on Sunday, May 16, 2010 at 11:40am.

- trig -
**drwls**, Sunday, May 16, 2010 at 11:50amLet's work on the left side of that possible identity.

cosx + sinx*tanx = cosx + sin^2x /cosx

= cosx + (1 - cos^2x)/cosx

= cosx + 1/cosx - cosx = 1/cosx = secx

That agrees with the right side, so the identity is true.

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